diff --git a/Limelight/AppDelegate.m b/Limelight/AppDelegate.m
index 2783fd1..680aa5f 100644
--- a/Limelight/AppDelegate.m
+++ b/Limelight/AppDelegate.m
@@ -88,8 +88,7 @@ static NSOperationQueue* mainQueue;
     if (_managedObjectModel != nil) {
         return _managedObjectModel;
     }
-    NSURL *modelURL = [[NSBundle mainBundle] URLForResource:@"Limelight_iOS" withExtension:@"momd"];
-    _managedObjectModel = [[NSManagedObjectModel alloc] initWithContentsOfURL:modelURL];
+    _managedObjectModel = [NSManagedObjectModel mergedModelFromBundles:nil];
     return _managedObjectModel;
 }
 
diff --git a/Limelight/Network/HttpManager.m b/Limelight/Network/HttpManager.m
index 2ac68e9..21121e7 100644
--- a/Limelight/Network/HttpManager.m
+++ b/Limelight/Network/HttpManager.m
@@ -38,7 +38,8 @@ static const NSString* PORT = @"47984";
     
     // Check root status_code
     if (![HttpManager verifyStatus: rootNode]) {
-        //TODO: handle error
+        NSLog(@"ERROR: Request returned with failure status");
+        return NULL;
     }
     
     // Skip the root node
@@ -229,6 +230,7 @@ static const NSString* PORT = @"47984";
 
 - (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error {
     NSLog(@"connection error: %@", error);
+    dispatch_semaphore_signal(_requestLock);
 }
 
 @end
diff --git a/Limelight/Network/MDNSManager.m b/Limelight/Network/MDNSManager.m
index ce28a79..0feb314 100644
--- a/Limelight/Network/MDNSManager.m
+++ b/Limelight/Network/MDNSManager.m
@@ -9,10 +9,12 @@
 #import "MDNSManager.h"
 #import "Computer.h"
 
-@implementation MDNSManager : NSObject
-NSNetServiceBrowser* mDNSBrowser;
-NSMutableArray* domains;
-NSMutableArray* services;
+@implementation MDNSManager {
+    NSNetServiceBrowser* mDNSBrowser;
+    NSMutableArray* domains;
+    NSMutableArray* services;
+    BOOL scanActive;
+}
 
 static NSString* NV_SERVICE_TYPE = @"_nvstream._tcp";
 
@@ -32,11 +34,13 @@ static NSString* NV_SERVICE_TYPE = @"_nvstream._tcp";
 
 - (void) searchForHosts {
     NSLog(@"Starting mDNS discovery");
+    scanActive = TRUE;
     [mDNSBrowser searchForServicesOfType:NV_SERVICE_TYPE inDomain:@""];
 }
 
 - (void) stopSearching {
     NSLog(@"Stopping mDNS discovery");
+    scanActive = FALSE;
     [mDNSBrowser stop];
 }
 
@@ -47,7 +51,7 @@ static NSString* NV_SERVICE_TYPE = @"_nvstream._tcp";
             [hosts addObject:[[Computer alloc] initWithHost:service]];
         }
     }
-    return [[NSArray alloc] initWithArray:hosts];
+    return hosts;
 }
 
 - (void)netServiceDidResolveAddress:(NSNetService *)service {
@@ -74,6 +78,24 @@ static NSString* NV_SERVICE_TYPE = @"_nvstream._tcp";
 - (void)netServiceBrowser:(NSNetServiceBrowser *)aNetServiceBrowser didNotSearch:(NSDictionary *)errorDict {
     NSLog(@"Did not perform search");
     NSLog(@"%@", [errorDict description]);
+    
+    // Schedule a retry in 2 seconds
+    [NSTimer scheduledTimerWithTimeInterval:2.0
+                                     target:self
+                                   selector:@selector(retryTimerCallback:)
+                                   userInfo:nil
+                                    repeats:NO];
+}
+
+- (void)retryTimerCallback:(NSTimer *)timer {
+    // Check if we've been stopped since this was queued
+    if (!scanActive) {
+        return;
+    }
+    
+    NSLog(@"Retrying mDNS search");
+    [mDNSBrowser stop];
+    [mDNSBrowser searchForServicesOfType:NV_SERVICE_TYPE inDomain:@""];
 }
 
 @end
\ No newline at end of file
diff --git a/Limelight/Stream/Connection.h b/Limelight/Stream/Connection.h
index e4a9735..05a1384 100644
--- a/Limelight/Stream/Connection.h
+++ b/Limelight/Stream/Connection.h
@@ -10,15 +10,22 @@
 #import "VideoDecoderRenderer.h"
 #import "StreamConfiguration.h"
 
-@protocol ConTermCallback <NSObject>
+@protocol ConnectionCallbacks <NSObject>
 
-- (void) connectionTerminated;
+- (void) connectionStarted;
+- (void) connectionTerminated:(long)errorCode;
+- (void) stageStarting:(char*)stageName;
+- (void) stageComplete:(char*)stageName;
+- (void) stageFailed:(char*)stageName withError:(long)errorCode;
+- (void) launchFailed;
+- (void) displayMessage:(char*)message;
+- (void) displayTransientMessage:(char*)message;
 
 @end
 
 @interface Connection : NSOperation <NSStreamDelegate>
 
--(id) initWithConfig:(StreamConfiguration*)config renderer:(VideoDecoderRenderer*)myRenderer connectionTerminatedCallback:(id<ConTermCallback>)callback;
+-(id) initWithConfig:(StreamConfiguration*)config renderer:(VideoDecoderRenderer*)myRenderer connectionCallbacks:(id<ConnectionCallbacks>)callbacks;
 -(void) terminate;
 -(void) main;
 
diff --git a/Limelight/Stream/Connection.m b/Limelight/Stream/Connection.m
index 139adc6..9679260 100644
--- a/Limelight/Stream/Connection.m
+++ b/Limelight/Stream/Connection.m
@@ -20,11 +20,10 @@
     CONNECTION_LISTENER_CALLBACKS _clCallbacks;
     DECODER_RENDERER_CALLBACKS _drCallbacks;
     AUDIO_RENDERER_CALLBACKS _arCallbacks;
-    
 }
 
 static OpusDecoder *opusDecoder;
-static id<ConTermCallback> _callback;
+static id<ConnectionCallbacks> _callbacks;
 
 #define PCM_BUFFER_SIZE 1024
 #define OUTPUT_BUS 0
@@ -243,37 +242,37 @@ void ArDecodeAndPlaySample(char* sampleData, int sampleLength)
 
 void ClStageStarting(int stage)
 {
+    [_callbacks stageStarting:(char*)LiGetStageName(stage)];
 }
 
 void ClStageComplete(int stage)
 {
+    [_callbacks stageComplete:(char*)LiGetStageName(stage)];
 }
 
 void ClStageFailed(int stage, long errorCode)
 {
-    printf("Stage %d failed: %ld\n", stage, errorCode);
+    [_callbacks stageFailed:(char*)LiGetStageName(stage) withError:errorCode];
 }
 
 void ClConnectionStarted(void)
 {
-    printf("Connection started\n");
+    [_callbacks connectionStarted];
 }
 
 void ClConnectionTerminated(long errorCode)
 {
-    printf("ConnectionTerminated: %ld\n", errorCode);
-    
-    [_callback connectionTerminated];
+    [_callbacks connectionTerminated: errorCode];
 }
 
 void ClDisplayMessage(char* message)
 {
-    printf("DisplayMessage: %s\n", message);
+    [_callbacks displayMessage: message];
 }
 
 void ClDisplayTransientMessage(char* message)
 {
-    printf("DisplayTransientMessage: %s\n", message);
+    [_callbacks displayTransientMessage: message];
 }
 
 -(void) terminate
@@ -286,12 +285,12 @@ void ClDisplayTransientMessage(char* message)
     });
 }
 
--(id) initWithConfig:(StreamConfiguration*)config renderer:(VideoDecoderRenderer*)myRenderer connectionTerminatedCallback:(id<ConTermCallback>)callback
+-(id) initWithConfig:(StreamConfiguration*)config renderer:(VideoDecoderRenderer*)myRenderer connectionCallbacks:(id<ConnectionCallbacks>)callbacks
 {
     self = [super init];
     _host = config.hostAddr;
     renderer = myRenderer;
-    _callback = callback;
+    _callbacks = callbacks;
     _streamConfig.width = config.width;
     _streamConfig.height = config.height;
     _streamConfig.fps = config.frameRate;
diff --git a/Limelight/Stream/StreamManager.h b/Limelight/Stream/StreamManager.h
index 4f865f2..d0dd6d3 100644
--- a/Limelight/Stream/StreamManager.h
+++ b/Limelight/Stream/StreamManager.h
@@ -12,7 +12,7 @@
 
 @interface StreamManager : NSOperation
 
-- (id) initWithConfig:(StreamConfiguration*)config renderView:(UIView*)view connectionTerminatedCallback:(id<ConTermCallback>)callback;
+- (id) initWithConfig:(StreamConfiguration*)config renderView:(UIView*)view connectionCallbacks:(id<ConnectionCallbacks>)callback;
 - (void) stopStream;
 
 @end
diff --git a/Limelight/Stream/StreamManager.m b/Limelight/Stream/StreamManager.m
index 21e4cb7..d8135df 100644
--- a/Limelight/Stream/StreamManager.m
+++ b/Limelight/Stream/StreamManager.m
@@ -14,15 +14,15 @@
 @implementation StreamManager {
     StreamConfiguration* _config;
     UIView* _renderView;
-    id<ConTermCallback> _callback;
+    id<ConnectionCallbacks> _callbacks;
     Connection* _connection;
 }
 
-- (id) initWithConfig:(StreamConfiguration*)config renderView:(UIView*)view connectionTerminatedCallback:(id<ConTermCallback>)callback {
+- (id) initWithConfig:(StreamConfiguration*)config renderView:(UIView*)view connectionCallbacks:(id<ConnectionCallbacks>)callbacks {
     self = [super init];
     _config = config;
     _renderView = view;
-    _callback = callback;
+    _callbacks = callbacks;
     _config.riKey = [Utils randomBytes:16];
     _config.riKeyId = arc4random();
     _config.bitRate = 10000;
@@ -50,7 +50,7 @@
     }
     
     VideoDecoderRenderer* renderer = [[VideoDecoderRenderer alloc]initWithView:_renderView];
-    _connection = [[Connection alloc] initWithConfig:_config renderer:renderer connectionTerminatedCallback:_callback];
+    _connection = [[Connection alloc] initWithConfig:_config renderer:renderer connectionCallbacks:_callbacks];
     NSOperationQueue* opQueue = [[NSOperationQueue alloc] init];
     [opQueue addOperation:_connection];
 }
@@ -60,7 +60,7 @@
     [_connection terminate];
 }
 
-- (void) launchApp:(HttpManager*)hMan {
+- (BOOL) launchApp:(HttpManager*)hMan {
     NSData* launchResp = [hMan executeRequestSynchronously:
                           [hMan newLaunchRequest:@"67339056"
                                            width:_config.width
@@ -68,14 +68,24 @@
                                      refreshRate:_config.frameRate
                                            rikey:[Utils bytesToHex:_config.riKey]
                                          rikeyid:_config.riKeyId]];
-    [HttpManager getStringFromXML:launchResp tag:@"gamesession"];
+    NSString *gameSession = [HttpManager getStringFromXML:launchResp tag:@"gamesession"];
+    if (gameSession == NULL || [gameSession isEqualToString:@"0"]) {
+        return FALSE;
+    }
+    
+    return TRUE;
 }
 
-- (void) resumeApp:(HttpManager*)hMan {
+- (BOOL) resumeApp:(HttpManager*)hMan {
     NSData* resumeResp = [hMan executeRequestSynchronously:
                           [hMan newResumeRequestWithRiKey:[Utils bytesToHex:_config.riKey]
                                                   riKeyId:_config.riKeyId]];
-    [HttpManager getStringFromXML:resumeResp tag:@"gamesession"];
+    NSString *resume = [HttpManager getStringFromXML:resumeResp tag:@"resume"];
+    if (resume == NULL || [resume isEqualToString:@"0"]) {
+        return FALSE;
+    }
+    
+    return TRUE;
 }
 
 @end
diff --git a/Limelight/Utility/Computer.h b/Limelight/Utility/Computer.h
index 854a3dd..dc0058c 100644
--- a/Limelight/Utility/Computer.h
+++ b/Limelight/Utility/Computer.h
@@ -15,5 +15,6 @@
 
 - (id) initWithHost:(NSNetService*)host;
 - (id) initWithIp:(NSString*)host;
+- (id) initPlaceholder;
 
 @end
diff --git a/Limelight/Utility/Computer.m b/Limelight/Utility/Computer.m
index 6a7cb22..fa8deb9 100644
--- a/Limelight/Utility/Computer.m
+++ b/Limelight/Utility/Computer.m
@@ -28,4 +28,13 @@
     return self;
 }
 
+- (id) initPlaceholder {
+    self = [super init];
+    
+    self.hostName = NULL;
+    self.displayName = @"No computers found";
+    
+    return self;
+}
+
 @end
diff --git a/Limelight/Utility/Utils.m b/Limelight/Utility/Utils.m
index f030295..96d678a 100644
--- a/Limelight/Utility/Utils.m
+++ b/Limelight/Utility/Utils.m
@@ -67,7 +67,7 @@
             return addr;
         } else {
             NSLog(@"Failed to resolve host: %d", h_errno);
-            return -1;
+            return 0;
         }
     }
 }
diff --git a/Limelight/ViewControllers/MainFrameViewController.m b/Limelight/ViewControllers/MainFrameViewController.m
index 07db5a6..6c1dd61 100644
--- a/Limelight/ViewControllers/MainFrameViewController.m
+++ b/Limelight/ViewControllers/MainFrameViewController.m
@@ -34,10 +34,21 @@ static StreamConfiguration* streamConfig;
         _selectedHost = [[Computer alloc] initWithIp:self.hostTextField.text];
         NSLog(@"Using custom host: %@", self.hostTextField.text);
     }
+    
+    if (![self validatePcSelected]) {
+        NSLog(@"No valid PC selected");
+        return;
+    }
+    
     [CryptoManager generateKeyPairUsingSSl];
     NSString* uniqueId = [CryptoManager getUniqueID];
     NSData* cert = [CryptoManager readCertFromFile];
     
+    if ([Utils resolveHost:_selectedHost.hostName] == 0) {
+        [self displayDnsFailedDialog];
+        return;
+    }
+    
     HttpManager* hMan = [[HttpManager alloc] initWithHost:_selectedHost.hostName uniqueId:uniqueId deviceName:@"roth" cert:cert];
     PairManager* pMan = [[PairManager alloc] initWithManager:hMan andCert:cert callback:self];
 
@@ -67,6 +78,14 @@ static StreamConfiguration* streamConfig;
     });
 }
 
+- (void)displayDnsFailedDialog {
+    UIAlertController* alert = [UIAlertController alertControllerWithTitle:@"Network Error"
+                                                                   message:@"Failed to resolve host."
+                                                            preferredStyle:UIAlertControllerStyleAlert];
+    [alert addAction:[UIAlertAction actionWithTitle:@"Ok" style:UIAlertActionStyleDestructive handler:nil]];
+    [self presentViewController:alert animated:YES completion:nil];
+}
+
 - (void)StreamButton:(UIButton *)sender
 {
     NSLog(@"Stream Button Pressed!");
@@ -74,9 +93,19 @@ static StreamConfiguration* streamConfig;
         _selectedHost = [[Computer alloc] initWithIp:self.hostTextField.text];
         NSLog(@"Using custom host: %@", self.hostTextField.text);
     }
+    
+    if (![self validatePcSelected]) {
+        NSLog(@"No valid PC selected");
+        return;
+    }
+    
     streamConfig = [[StreamConfiguration alloc] init];
     streamConfig.host = _selectedHost.hostName;
     streamConfig.hostAddr = [Utils resolveHost:_selectedHost.hostName];
+    if (streamConfig.hostAddr == 0) {
+        [self displayDnsFailedDialog];
+        return;
+    }
     
     unsigned long selectedConf = [self.StreamConfigs selectedRowInComponent:0];
     NSLog(@"selectedConf: %ld", selectedConf);
@@ -122,10 +151,19 @@ static StreamConfiguration* streamConfig;
     }
 }
 
+- (void)setSelectedHost:(NSInteger)selectedIndex
+{
+    _selectedHost = (Computer*)([self.hostPickerVals objectAtIndex:selectedIndex]);
+    if (_selectedHost.hostName == NULL) {
+        // This must be the placeholder computer
+        _selectedHost = NULL;
+    }
+}
+
 - (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component
 {
     if (pickerView == self.HostPicker) {
-        _selectedHost = (Computer*)([self.hostPickerVals objectAtIndex:[self.HostPicker selectedRowInComponent:0]]);
+        [self setSelectedHost:[self.HostPicker selectedRowInComponent:0]];
     }
     
     //TODO: figure out how to save this info!!
@@ -154,10 +192,12 @@ static StreamConfiguration* streamConfig;
     [super viewDidLoad];
 
     self.streamConfigVals = [[NSArray alloc] initWithObjects:@"1280x720 (30Hz)", @"1280x720 (60Hz)", @"1920x1080 (30Hz)", @"1920x1080 (60Hz)",nil];
-    self.hostPickerVals = [[NSArray alloc] init];
     [self.StreamConfigs selectRow:1 inComponent:0 animated:NO];
     
     _opQueue = [[NSOperationQueue alloc] init];
+    
+    // Initialize the host picker list
+    [self updateHosts:[[NSArray alloc] init]];
 }
 
 - (void)viewDidAppear:(BOOL)animated
@@ -172,9 +212,29 @@ static StreamConfiguration* streamConfig;
 }
 
 - (void)updateHosts:(NSArray *)hosts {
-    self.hostPickerVals = hosts;
+    NSMutableArray *hostPickerValues = [[NSMutableArray alloc] initWithArray:hosts];
+    
+    if ([hostPickerValues count] == 0) {
+        [hostPickerValues addObject:[[Computer alloc] initPlaceholder]];
+    }
+    
+    self.hostPickerVals = hostPickerValues;
     [self.HostPicker reloadAllComponents];
-    _selectedHost = (Computer*)([self.hostPickerVals objectAtIndex:[self.HostPicker selectedRowInComponent:0]]);
+    
+    [self setSelectedHost:[self.HostPicker selectedRowInComponent:0]];
+}
+
+- (BOOL)validatePcSelected {
+    if (_selectedHost == NULL) {
+        UIAlertController* alert = [UIAlertController alertControllerWithTitle:@"No PC Selected"
+                                                                       message:@"You must select a PC to continue."
+                                                                preferredStyle:UIAlertControllerStyleAlert];
+        [alert addAction:[UIAlertAction actionWithTitle:@"Ok" style:UIAlertActionStyleDestructive handler:nil]];
+        [self presentViewController:alert animated:YES completion:nil];
+        return FALSE;
+    }
+    
+    return TRUE;
 }
 
 - (void)didReceiveMemoryWarning
diff --git a/Limelight/ViewControllers/StreamFrameViewController.h b/Limelight/ViewControllers/StreamFrameViewController.h
index adbcd29..07a1374 100644
--- a/Limelight/ViewControllers/StreamFrameViewController.h
+++ b/Limelight/ViewControllers/StreamFrameViewController.h
@@ -10,6 +10,6 @@
 
 #import <UIKit/UIKit.h>
 
-@interface StreamFrameViewController : UIViewController <ConTermCallback>
+@interface StreamFrameViewController : UIViewController <ConnectionCallbacks>
 
 @end
diff --git a/Limelight/ViewControllers/StreamFrameViewController.m b/Limelight/ViewControllers/StreamFrameViewController.m
index f8a2103..18758c2 100644
--- a/Limelight/ViewControllers/StreamFrameViewController.m
+++ b/Limelight/ViewControllers/StreamFrameViewController.m
@@ -29,7 +29,9 @@
     
     _controllerSupport = [[ControllerSupport alloc] init];
     
-    _streamMan = [[StreamManager alloc] initWithConfig:[MainFrameViewController getStreamConfiguration] renderView:self.view connectionTerminatedCallback:self];
+    _streamMan = [[StreamManager alloc] initWithConfig:[MainFrameViewController getStreamConfiguration]
+                                            renderView:self.view
+                                   connectionCallbacks:self];
     NSOperationQueue* opQueue = [[NSOperationQueue alloc] init];
     [opQueue addOperation:_streamMan];
     
@@ -44,7 +46,13 @@
     [self performSegueWithIdentifier:@"returnToMainFrame" sender:self];
 }
 
-- (void)connectionTerminated {
+- (void) connectionStarted {
+    printf("Connection started\n");
+}
+
+- (void)connectionTerminated:(long)errorCode {
+    printf("Connection terminated: %ld\n", errorCode);
+    
     UIAlertController* conTermAlert = [UIAlertController alertControllerWithTitle:@"Connection Terminated" message:@"The connection terminated unexpectedly" preferredStyle:UIAlertControllerStyleAlert];
     [conTermAlert addAction:[UIAlertAction actionWithTitle:@"Ok" style:UIAlertActionStyleDestructive handler:^(UIAlertAction* action){
         [self performSegueWithIdentifier:@"returnToMainFrame" sender:self];
@@ -54,6 +62,36 @@
     [_streamMan stopStream];
 }
 
+- (void) stageStarting:(char*)stageName {
+    printf("Starting %s\n", stageName);
+}
+
+- (void) stageComplete:(char*)stageName {
+}
+
+- (void) stageFailed:(char*)stageName withError:(long)errorCode {
+    UIAlertController* alert = [UIAlertController alertControllerWithTitle:@"Connection Failed"
+                                                                   message:[NSString stringWithFormat:@"%s failed with error %ld",
+                                                                             stageName, errorCode]
+                                                            preferredStyle:UIAlertControllerStyleAlert];
+    [alert addAction:[UIAlertAction actionWithTitle:@"Ok" style:UIAlertActionStyleDestructive handler:^(UIAlertAction* action){
+        [self performSegueWithIdentifier:@"returnToMainFrame" sender:self];
+    }]];
+    [self presentViewController:alert animated:YES completion:nil];
+}
+
+- (void) launchFailed {
+    
+}
+
+- (void) displayMessage:(char*)message {
+    printf("Display message: %s\n", message);
+}
+
+- (void) displayTransientMessage:(char*)message {
+    printf("Display transient message: %s\n", message);
+}
+
 - (void)didReceiveMemoryWarning
 {
     [super didReceiveMemoryWarning];